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| compression piston ring; gas piston ring; gas-tight piston ring; piston compression ring; piston junk ring | |||
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活塞压环 : 21 phrases in 5 subjects |
| Automobiles | 10 |
| Aviation | 1 |
| Compressors | 1 |
| Shipbuilding | 1 |
| Technology | 8 |
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